were looking at a d7f to have a second machine. just cant keep up with one anymore anyway a guy i know has one--- 90% under carriage, rebuilt engine, new steering clutches and brakes. newer trans. rebuilt torque. guy wants mid 30's for it i heard a couple times that they have weak transmissions. this true? or did later models have this corrected? how are they as a machine on the whole?
My advise is to go for a late model D7E (the first E series) or a G. The F series was not built very long. As I recall they took the 3306 engine, turned it up to 200 Horse and hooked it to the old D6 C transmission and had problems. The G series corrected everything wrong with the F's. The D7 E's had 339 engine (same as 342 only the 4 cylinder version) and started with 160 HP later turned up to 180 Horse. Still running D7 E here and love it to death.
Someone correct me if I'm wrong but I've been told that with the small engines they were really light on the front end and had a tendency towards sitting on their haunches.
from what i hear earlier 7f's had the older transmission, and later model f's and then g's got the d6c transmission--- how do i tell which transmission it has?
D7f I think around the 5000 serial #range was the later trans. A good parts man should be able to tell what serial # thechange was.
Take a tip from me mate !!! Give the 7F a big miss !! F is for failure !!
so whats all wrong with them? from what i understand guys dont like the small 3306 engine in them--- but doesnt the G have the same engine? is the upgraded trans from the d6c still not very good? what trans does a G have? i'm just trying to learn all i can here.
I personally bought a D7F about a year ago. I have no complaints, it will push hard all day and doesn't use any oil. It will get warm on a hot summer day if you are moving lots of dirt, but it cools off quickly when not pushing. I've heard lots of bad stuff about the F, but I have no complaints. We also have a D6M and that 7F will move more dirt in a days time than the newer dozer. It will drink the fuel, so be prepared.
would it use more fuel than a low horse d8h? cause my 8 is actually quite fair on fuel--- probably around 10 gph at the very most
I would guess it's probably close to 10 gph. We usually go through between 70 and 90 gallons a day, depending on how long we work and what we are up to. Ours just seems to burn more fuel than the D6M, maybe because it's older and bigger.
right on thanks for the info!
so does anyone know how to visually tell the difference between the old trans and the new trans?
What is the serial # of the machine?
17xx it's an older machine, but the guy was told when he bought it that it had the upgraded trans. another guy looked at it and said it's been changed too. but i want to know what to look for myself.
I don't think that's the serial for the machine you're looking at. The possible serial prefixes i show for a D7F Track-Type Tractor are 61G, 92E, 93N and 94N... if you could, get the five digits following the prefix (EX. 93N12345).
yes the 17xx is following the first 3 letter prefix-- but i dont know what it is. i'll find out quickly here.
serial # 92e 1753
Crawler Tractors Caterpillar Model Series Weight 34,000 D7F 92E (JP) Length 14' 8" Engine D339 180HP Width 8' 5" Eng. S/N Height 7' 7" Gauge 78" Direct Drive, D333T S/N 92E02672-up Sleeve Metering Fuel System Serial # Serial # From To Year UpGrd From To Year UpGrd 00267 - 00420 70 01888 - 02669 74 00421 - 00807 71 02670 - 03124 75 ■ 00808 - 01332 72 03125 - 03144 76 01333 - 01887 73
Info I got from the toughquip 2006 CD. Don't know if it's accurate
this machine has a 3306 engine and power shift...
Caterpillar Performance Handbook Edition 35 confirms your figures Dude with a minor difference in weight (32,400). States that drawbar pull and speeds are identical to the post 1966 7 E's. Says E series is a foot longer overall. Maybe why that's why the E "feels" a little more balanced:IMO.....or maybe I'm not quite balanced!
http://www.ritchiewiki.com/wiki/index.php/D7F Not much on the 92E
92E is the earliest of the D7F’s and would have the older transmission in it. If they changed the transmission, the only way i would know is by checking the casting number on the case. If you get any numbers off the trans, post them on here and we should be able to confirm what type it is.
where would the casting numbers be
Hard to say. They aren't always in one place. If you get to look at the machine, just look for any numbers stamped/casted into the transmission.
The D333 (early) and 3306 (later) weigh the same so there is no difference in weight in the front end of an early machine and later machine. If anything they needed weight on the rear that is why a lot of machines had cable unit hung on the rear.
The early D7F had a D333 series C engine, the later D7F and early D7G had a 3306 PC engine. Later D7G's had a 3306 DI engine 200 plus will not hurt these engines. They put out a lot more HP than that in other aplication and took it. The D333 and 3306 engines were good lugging, fast reving engines. They had a good torque cure, they were bullet proof engines it took something real stupid to hurt them. They are better engines than the old slow reving four banger in the D7E tractor. The first D7F has some problems but that was taken care of. (still a lot better transmission than a D7E transmission. The later D7F and D7G have the same transmission which is basically the same as the D6C, D6D, D6E. 200 plus HP is nothing for that transmission. I have seen D6's with 200 hp and D7's with 250 Hp and the transmission take it with no problem. The D7F and D7G are basically the same tractor except for the combine steering/braking. I have owned D7E', D7F's and D7G's and the D7F and D7G are ten times the tractor as a D7E.
If the transmission, engine, steering clutches have recent rebuilds and with good of bottom, that is not the cheapest, but not out of line. Don't be scared of the transmission they are a good transmission. I bought one and put over 16,000 hours on it before I did anything major to it.
With 1/2 hr left on this auction this 7F as at $12,500...but it no doubt needs some work and may need the trans upgraded to later specs. The military doesn't usually put all that many hours on their equipement, but they suffer from sitting for long periods. http://www.govliquidation.com/auction/view?id=2862549&convertTo=USD